package com.summer.springcloud.config.lb.impl;

import com.summer.springcloud.config.lb.LoadBalancer;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class LoadBalancereImpl implements LoadBalancer {
    private  AtomicInteger atomicInteger=new AtomicInteger(0);
    public final int getAndIncrement(){
        int current;
        int next;
        do {
            current=this.atomicInteger.get();
            next=current>=2147483647?0:current+1;
        }while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("******第几次访问:next:"+next);
        return next;
    }
    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {
      int index=getAndIncrement()%serviceInstances.size();

        return serviceInstances.get(index);
    }
}
